The `<tc:link/>` tag can be added to a `<tc:treeNode/>` tag. The command can be used to execute an action or a link.

In this example, the nodes with children are displayed as `<tc:treeLabel/>`. The leafs are `<tc:treeCommand/>`. Like the parent nodes suggest, the entries in 'Actions' run an action with the `action` attribute. And the entries in 'Links' are links to an external website using the `link` attribute.